A wireless LAN or WLAN is a wireless local area network, which is the linking of two or more computers without using wires. It uses radio communication to accomplish the same functionality that a wired LAN has. WLAN utilizes spread-spectrum technology based on radio waves to enable communication between devices in a limited area, also known as the basic service set. This gives users the mobility to move around within a broad coverage area and still be connected to the network.

    source - Wireless LAN. (2006, August 31). In Wikipedia, The Free Encyclopedia. Retrieved August 31, 2006, from http://en.wikipedia.org/wiki/WLAN

For the purposes of Hautspot technology, the term WLAN is synonymous with hotspot or hotzone.